Terry Cain's BIB -why does it work and does anyone have those Fostex Craft Handbooks? - Page 73

el`Ol · 22nd May 2006, 06:31 PM

I have a principal question: is it possible to remove a peak that`s close to Fs, where the impedance curve isn`t flat?

GM · 22nd May 2006, 06:44 PM

Greets!

?? Do you mean underdamped peaking, which means either series R is required or Sm needs to be smaller?

GM

el`Ol · 22nd May 2006, 07:24 PM

I have a peak slightly above 100Hz in the simulation that could probably not be removed by damping and would like to use a passive notch filter for correction. Drivers with too low Qts peak at very low frequencies and have a deep and wide hole above, what could probably be corrected by a series resistor, I don`t mean that.

GM · 23rd May 2006, 01:04 AM

Greets!

You can, though it won't be flat without a zobel, or if it's too near Fs, then a series notch filter to flatten the Fs peak.

GM

fred76 · 23rd May 2006, 09:05 AM

Quote:

Originally posted by GM

Greets!

I assume so, based solely on comparing published specs. You need at least this much to get a ~BIB response, so if the amp has more, it will alter the response similar to adding the difference in series R to a driver that doesn't need it.

GM

Hi GM,

So you mean if the amp has high enough output Z to offset the driver's need for a series R filter, it could still have a ~good response for a BIB? So am I right to assume that it's still "build and listen with and without series notch filter" to suit to taste? Thanks.

fred

GM · 23rd May 2006, 12:58 PM

Greets!

Correct.

GM

Ray Collins · 23rd May 2006, 04:27 PM

I am at the point of finishing the cabinets and thought that an intermediate progress report might be of interest. The cabinets are on my consumable cutting table and are ready for the side to be attached. I stripped out two pairs of CAT5 and bonded them to the inside with silicon.

Ray Collins · 23rd May 2006, 04:31 PM

My apologies.....the picture file size is too large and will not transmitt. If anyone has a suggestion please provide it.

Godzilla · 23rd May 2006, 04:41 PM

I hope this cat 5 thing works... i wired my BIB with it because i didnt have regular speaker wire..... 8 strands.... 4 to positive.... 4 negative... 24 guage each little strand.

Ray Collins · 23rd May 2006, 04:47 PM

Godzilla:
I do too. I used the CAT5 for the same reason.....I was out of speaker wire and zip cord.

Can you help with my picture problem?

22nd May 2006, 06:44 PM	#722
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Greets! ?? Do you mean underdamped peaking, which means either series R is required or Sm needs to be smaller? GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

23rd May 2006, 01:04 AM	#724
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Greets! You can, though it won't be flat without a zobel, or if it's too near Fs, then a series notch filter to flatten the Fs peak. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

23rd May 2006, 12:58 PM	#726
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Greets! Correct. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

23rd May 2006, 04:27 PM	#727
Ray Collins diyAudio Member Join Date: Jan 2006 Location: Mobile, Al.	Progress Report I am at the point of finishing the cabinets and thought that an intermediate progress report might be of interest. The cabinets are on my consumable cutting table and are ready for the side to be attached. I stripped out two pairs of CAT5 and bonded them to the inside with silicon.

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22nd May 2006, 06:31 PM	#721
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	I have a principal question: is it possible to remove a peak that`s close to Fs, where the impedance curve isn`t flat?

22nd May 2006, 07:24 PM	#723
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	I have a peak slightly above 100Hz in the simulation that could probably not be removed by damping and would like to use a passive notch filter for correction. Drivers with too low Qts peak at very low frequencies and have a deep and wide hole above, what could probably be corrected by a series resistor, I don`t mean that.

23rd May 2006, 04:31 PM	#728
Ray Collins diyAudio Member Join Date: Jan 2006 Location: Mobile, Al.	My apologies.....the picture file size is too large and will not transmitt. If anyone has a suggestion please provide it.

23rd May 2006, 04:41 PM	#729
Godzilla diyAudio Member Join Date: Nov 2005 Location: New York	I hope this cat 5 thing works... i wired my BIB with it because i didnt have regular speaker wire..... 8 strands.... 4 to positive.... 4 negative... 24 guage each little strand.

23rd May 2006, 04:47 PM	#730
Ray Collins diyAudio Member Join Date: Jan 2006 Location: Mobile, Al.	Godzilla: I do too. I used the CAT5 for the same reason.....I was out of speaker wire and zip cord. Can you help with my picture problem?

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